Drill-jar



(No Modem I -BQUEEN DRILL JAR.

A N`0.315,547. PatentedApr.-14,1885.

il I Timm IIIIIIIIIIHHHI lh. l5 /lllL UNITED STATES -PATENT (')EEICEt EMMET QUEEN, oE-JoHNsTowN, PENNSYLVANIA.

DRILL-JAR.

SPECIFICATION forming part of Letters Patent No. 315,547, dated April 14, 1885.

Application iiled January 7, 1835. (No model.)

To @ZZ whom it may concern,.-

Be it known that I, EMMET QUEEN, a citizen of the United States of America, residing at Johnstown, in the county of Cambria and Staterof Pennsylvania, have invented certain new and useful Improvements in Drill-Jars; and I do hereby' declare the following to .be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specilication.

This invention relates to certain improvements, as hereinafter described and claimed, in drill-j ars for jarring loose the drilling-tools employed in drilling wells, shafts, and the like.

Heretofore drill -j ars have been constructed, some with a vertically-slotted barrel or tube, in the slots of which pins on a cylindrical piston-head slide, while others have had the piston-head formed with iiat sides and ends, and still others with the piston-rod extended below the bottom of the piston-head, and the barrel provided with a central socket-to receive the lower end of the piston-rod.

In constructing my drill-jar I form the cylinder or barrel with inside walls of circular or elliptical shape in cross-section, and with diametrically-opposite vertical slots, and the piston-head or plunger elliptical or oval in 4cross-section, and with sidewise-.projecting wings, whereby the friction between the piston-head and barrel is reduced toa minimum, an easy reciprocation of the piston and pistonhead is assured, the choking and binding of the parts prevented, and the loosening or breaking of the guiding devices prevented.

In the accompanying drawings, Figure l represents a vertical elevation, partly in section, of one of my improved jars. Fig..2 is a vertical elevation thereof. Fig. 3 represents a transverse section ou the line 2 2 of Fig. 2, and Fig. 4 represents a perspective view of the piston-head and a portion of the piston.

The several devices to which drill-jars are connected for boring the wells and operating the boring-tools and the piston of the jar are so well known that I have not deemed it necessary to show them in the drawings, as they` two parts longitudinally, to permit of the plu nger and plunger-head being placed in position` being bolted or otherwise secured together.

lower end, C,`of the barrel, to which is connected the auger or drill stem. In lieu thereof, however, a r'ing or a plug having a socket, 'as B, therein may be connected to the lower end, either by screw-threads formed in the end of the tube Vand on the plug or other means. The bottom'of the cylinder is solid, as shown, to forman anvil to receive the impact of the bottom of the plunger-head. The upper end of the cylind erAis either reenforced or formed of increased thickness to provide a bearingA or bushing, D, for the piston-rod in its reciprocating movements; or a screw or other plug having a central bore may be inserted within the upper end of the cylinder A,

plunger and astop for the plunger-head. The side walls of the barrel A are elliptical in cross-section, and have formed therein, in di- G represents the piston or plunger head,

which is formed integral with or separate from and welded, swaged, or otherwise attached to the lower end of the` plunger-rod F. This head is, as shown in the drawings, formed of B represents a socket formed in the solid` for the purpose of affording a bearing for the than the bore ofthe well, sot-hat it will move freely therein, said Acylinder being formed in 6o or removed therefrom,when desired, said parts ametrically-oppositepositions,verticalslotsE. F represents the piston, which may be of elliptical or oval shape in cross-section, with V the wings or edges H thereof extending so as to enter and rest within the vertical slots E in the width of the circular or elliptical bore of the tube A, so that it may reciprocate snugly respective faces ofthe head and tube and imthe barrel or tube A. rlhe width of the elliptical-shaped head at its center about equals a roo therein, and prevent dirt getting between `the peding the movement of said head. The ton F and head G are formed of either cast or Wrought metal, as preferred.

By forming the head of elliptical or oval shape in crosssection the objection heretofore existing Where guide-pins are used of such pins becoming loose after some use, owing to frequent j arring, is avoided. Furthermore, the head has a smooth yet effective bearing over the entire area of each side, which insures a larger Wearing-surface and a greater steadiness and easiness of movementthan Where the head has a fiat or round face or faces, and the Wings or the edges entering the slots not only prevent the head and plunger turning in the tube A, but close the slots to the entrance of foreign matter to a greater degree than nwill be the case Where pins are used.

The Working heads of jars as now con structed Wear fast, and sometimes become battered, causing them to stick or bind Within the tube A and require chipping. My plunger-head, being elliptical and Ahaving the pisgreatest amount of Wearing-surface, is free from these objections, and as it Wears will also Wear away the sides of the slots, thus prevent ing the binding therein, and insuring a uniformity of bearing-surface at all times.

Having thus described my invention, what I claim is- 1. A drill-jar having an elliptical or ovalshaped plunger-head, substantially as and for the purpose set forth.

2. A drill-jar having a verticallyslotted tube, A, and a plunger adapted to reciprocate vertically Within said tube, and having a plunger-head elliptical in crosssection, adapted to rest and slide within said tube A and the slots therein, substantially as and for the purpose set forth.

In testimony whereof I aflx my signature in presence of two witnesses.

EMMET QUEEN.

Witnesses:

CHARLES B. MOORE, ALEX. ADAIR. 

